1, Zheng He went to the Western Ocean, and introduced some China characters to Japan in his cultural exchange with the Japanese.
2. When Japan invaded China, some Japanese officers introduced a large number of China characters into Japan.
The combination of the above two points forms a point of view. The invention of Japanese mainly comes from the Chinese characters in China, and the Japanese have transformed it according to their own cultural characteristics, becoming the present Japanese.
The earliest written cultural relics in Japan are about 1 century. At that time, Japanese scholars used Chinese characters to express Japanese sounds, which was called "training reading".
On this basis, the pseudonym Ye Wan was developed, which first appeared in the earliest Japanese poetry collection "Ye Wan Collection".
This method borrows the phonetic function of Chinese and abandons the structure of Chinese. In addition, Chinese does not use word forms flexibly and lacks auxiliary verbs. In the 9th century, Katakana and Hiragana based on China cursive script came out one after another, which completely evolved Japanese characters into the era of notation.